asmlinkage long sys_clock_settime(const clockid_t which_clock,
const struct timespec __user *tp)
{
struct timespec new_tp;
if (invalid_clockid(which_clock))
return -EINVAL;
if (copy_from_user(&new_tp, tp, sizeof (*tp)))
return -EFAULT;
return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp));
}
SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
const struct timespec __user *, tp)
{
struct timespec new_tp;
if (invalid_clockid(which_clock))
return -EINVAL;
if (copy_from_user(&new_tp, tp, sizeof (*tp)))
return -EFAULT;
return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp));
}
SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
struct timespec __user *,tp)
{
struct timespec kernel_tp;
int error;
if (invalid_clockid(which_clock))
return -EINVAL;
error = CLOCK_DISPATCH(which_clock, clock_get,
(which_clock, &kernel_tp));
if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
error = -EFAULT;
return error;
}
asmlinkage long
sys_clock_gettime(const clockid_t which_clock, struct timespec __user *tp)
{
struct timespec kernel_tp;
int error;
if (invalid_clockid(which_clock))
return -EINVAL;
error = CLOCK_DISPATCH(which_clock, clock_get,
(which_clock, &kernel_tp));
if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
error = -EFAULT;
return error;
}
SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
const struct timespec __user *, rqtp,
struct timespec __user *, rmtp)
{
struct timespec t;
if (invalid_clockid(which_clock))
return -EINVAL;
if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
return -EFAULT;
if (!timespec_valid(&t))
return -EINVAL;
return CLOCK_DISPATCH(which_clock, nsleep,
(which_clock, flags, &t, rmtp));
}
SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
struct timespec __user *, tp)
{
struct timespec rtn_tp;
int error;
if (invalid_clockid(which_clock))
return -EINVAL;
error = CLOCK_DISPATCH(which_clock, clock_getres,
(which_clock, &rtn_tp));
if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) {
error = -EFAULT;
}
return error;
}
asmlinkage long
sys_clock_getres(const clockid_t which_clock, struct timespec __user *tp)
{
struct timespec rtn_tp;
int error;
if (invalid_clockid(which_clock))
return -EINVAL;
error = CLOCK_DISPATCH(which_clock, clock_getres,
(which_clock, &rtn_tp));
if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) {
error = -EFAULT;
}
return error;
}
asmlinkage long
sys_clock_nanosleep(const clockid_t which_clock, int flags,
const struct timespec __user *rqtp,
struct timespec __user *rmtp)
{
struct timespec t;
if (invalid_clockid(which_clock))
return -EINVAL;
if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
return -EFAULT;
if (!timespec_valid(&t))
return -EINVAL;
return CLOCK_DISPATCH(which_clock, nsleep,
(which_clock, flags, &t, rmtp));
}
SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
struct sigevent __user *, timer_event_spec,
timer_t __user *, created_timer_id)
{
struct k_itimer *new_timer;
int error, new_timer_id;
sigevent_t event;
int it_id_set = IT_ID_NOT_SET;
if (invalid_clockid(which_clock))
return -EINVAL;
new_timer = alloc_posix_timer();
if (unlikely(!new_timer))
return -EAGAIN;
spin_lock_init(&new_timer->it_lock);
retry:
if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) {
error = -EAGAIN;
goto out;
}
spin_lock_irq(&idr_lock);
error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id);
spin_unlock_irq(&idr_lock);
if (error) {
if (error == -EAGAIN)
goto retry;
/*
* Weird looking, but we return EAGAIN if the IDR is
* full (proper POSIX return value for this)
*/
error = -EAGAIN;
goto out;
}
it_id_set = IT_ID_SET;
new_timer->it_id = (timer_t) new_timer_id;
new_timer->it_clock = which_clock;
new_timer->it_overrun = -1;
error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
if (error)
goto out;
/*
* return the timer_id now. The next step is hard to
* back out if there is an error.
*/
if (copy_to_user(created_timer_id,
&new_timer_id, sizeof (new_timer_id))) {
error = -EFAULT;
goto out;
}
if (timer_event_spec) {
if (copy_from_user(&event, timer_event_spec, sizeof (event))) {
error = -EFAULT;
goto out;
}
rcu_read_lock();
new_timer->it_pid = get_pid(good_sigevent(&event));
rcu_read_unlock();
if (!new_timer->it_pid) {
error = -EINVAL;
goto out;
}
} else {
event.sigev_notify = SIGEV_SIGNAL;
event.sigev_signo = SIGALRM;
event.sigev_value.sival_int = new_timer->it_id;
new_timer->it_pid = get_pid(task_tgid(current));
}
new_timer->it_sigev_notify = event.sigev_notify;
new_timer->sigq->info.si_signo = event.sigev_signo;
new_timer->sigq->info.si_value = event.sigev_value;
new_timer->sigq->info.si_tid = new_timer->it_id;
new_timer->sigq->info.si_code = SI_TIMER;
spin_lock_irq(¤t->sighand->siglock);
new_timer->it_signal = current->signal;
list_add(&new_timer->list, ¤t->signal->posix_timers);
spin_unlock_irq(¤t->sighand->siglock);
return 0;
/*
* In the case of the timer belonging to another task, after
* the task is unlocked, the timer is owned by the other task
* and may cease to exist at any time. Don't use or modify
* new_timer after the unlock call.
*/
out:
release_posix_timer(new_timer, it_id_set);
return error;
}
asmlinkage long
sys_timer_create(const clockid_t which_clock,
struct sigevent __user *timer_event_spec,
timer_t __user * created_timer_id)
{
int error = 0;
struct k_itimer *new_timer = NULL;
int new_timer_id;
struct task_struct *process = NULL;
unsigned long flags;
sigevent_t event;
int it_id_set = IT_ID_NOT_SET;
if (invalid_clockid(which_clock))
return -EINVAL;
new_timer = alloc_posix_timer();
if (unlikely(!new_timer))
return -EAGAIN;
spin_lock_init(&new_timer->it_lock);
retry:
if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) {
error = -EAGAIN;
goto out;
}
spin_lock_irq(&idr_lock);
error = idr_get_new(&posix_timers_id, (void *) new_timer,
&new_timer_id);
spin_unlock_irq(&idr_lock);
if (error == -EAGAIN)
goto retry;
else if (error) {
/*
* Wierd looking, but we return EAGAIN if the IDR is
* full (proper POSIX return value for this)
*/
error = -EAGAIN;
goto out;
}
it_id_set = IT_ID_SET;
new_timer->it_id = (timer_t) new_timer_id;
new_timer->it_clock = which_clock;
new_timer->it_overrun = -1;
error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
if (error)
goto out;
/*
* return the timer_id now. The next step is hard to
* back out if there is an error.
*/
if (copy_to_user(created_timer_id,
&new_timer_id, sizeof (new_timer_id))) {
error = -EFAULT;
goto out;
}
if (timer_event_spec) {
if (copy_from_user(&event, timer_event_spec, sizeof (event))) {
error = -EFAULT;
goto out;
}
new_timer->it_sigev_notify = event.sigev_notify;
new_timer->it_sigev_signo = event.sigev_signo;
new_timer->it_sigev_value = event.sigev_value;
read_lock(&tasklist_lock);
if ((process = good_sigevent(&event))) {
/*
* We may be setting up this process for another
* thread. It may be exiting. To catch this
* case the we check the PF_EXITING flag. If
* the flag is not set, the siglock will catch
* him before it is too late (in exit_itimers).
*
* The exec case is a bit more invloved but easy
* to code. If the process is in our thread
* group (and it must be or we would not allow
* it here) and is doing an exec, it will cause
* us to be killed. In this case it will wait
* for us to die which means we can finish this
* linkage with our last gasp. I.e. no code :)
*/
spin_lock_irqsave(&process->sighand->siglock, flags);
if (!(process->flags & PF_EXITING)) {
new_timer->it_process = process;
list_add(&new_timer->list,
&process->signal->posix_timers);
spin_unlock_irqrestore(&process->sighand->siglock, flags);
if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
get_task_struct(process);
} else {
spin_unlock_irqrestore(&process->sighand->siglock, flags);
process = NULL;
}
}
read_unlock(&tasklist_lock);
if (!process) {
error = -EINVAL;
goto out;
}
} else {
new_timer->it_sigev_notify = SIGEV_SIGNAL;
new_timer->it_sigev_signo = SIGALRM;
new_timer->it_sigev_value.sival_int = new_timer->it_id;
process = current->group_leader;
spin_lock_irqsave(&process->sighand->siglock, flags);
new_timer->it_process = process;
list_add(&new_timer->list, &process->signal->posix_timers);
spin_unlock_irqrestore(&process->sighand->siglock, flags);
}
/*
* In the case of the timer belonging to another task, after
* the task is unlocked, the timer is owned by the other task
* and may cease to exist at any time. Don't use or modify
* new_timer after the unlock call.
*/
out:
if (error)
release_posix_timer(new_timer, it_id_set);
return error;
}
